guides/user/Installation.md

@@ -49,13 +49,16 @@ all its dependencies.
 
 ### <a id="nix-source-based" href="#nix-source-based">Source based</a>
 
+<em>This is about installing the [Arachni Framework](https://github.com/Arachni/arachni)
+only and does not include the [WebUI](https://github.com/Arachni/arachni-ui-web).</em>
+
 To work with the source or install the Gem you'll need the dependencies listed at the top
 of this page.
 
 Please take into consideration that it is assumed that your system is suitably configured
 and that you will run the test suite in order to ensure that Arachni operates properly under
 your environment.
-If you are not comfortable with that, please try the [build script](#nix-build-scripts)
+If you are not comfortable with the above, please try the [build script](#nix-build-scripts)
 approach instead.
 
 Users of Debian-based distributions can run the following to install them: